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The title complexes have been synthesized by the reaction of [RhCI(CO)2]2 or [RhCI(COD)]2 (COD = 1,5-cyclooctadiene)with the organic ligand 2,4-dioxo-3-pentyl 4-decyloxy cinnamate 2. The complex 3 based on dicarbonylrhodium(I) shows nematic phase, while the complex 4 containing rhodium(I) bound to a COD ligand is a nonmesogen. The relationship between molecular structures and liquid crystal behavior has also been discussed by means of computer-aided molecular modeling. 相似文献
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A convenient synthesis of 3-substituted pyrazole derivatives by a mixed anhydride method using i-butylchloroformate and N-methylmorpholine at ?20 °C in tetrahydrofuran and study of in vitro antibacterial activities of the prepared compounds against Staphylococcus epidermidis, Bacillus subtilis, Pseudomonas aeruginosa, and Proteus valguris by agar-diffusion method were carried out. The results suggested that the products 4a, 4b, and 4c exhibited moderate to feeble inhibition against all test bacteria at greater concentration but 4d was best against Staphylococcus epidermidis (22 mm) and worst against Pseudomonas aeruginosa (16 mm) at the greatest concentration (2.5 mg/ml), and the activities decreased with decrease in concentration. [Supplementary materials are available for this article. Go to the publisher's online edition of Synthetic Communications® for the following free supplemental resource(s): Full experimental and spectral details.] 相似文献
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以N-羟基-4-甲氧基苯甲醛肟氯化物为原料,经两步反应制得3-对甲氧基苯基-5-甲基-异噁唑-4-甲酰肼(3);3依次经缩合和环合反应合成了一系列新型的2-芳基3-乙酰基-5-(3-对甲氧基苯基-5-甲基-异噁唑-4-基)-Δ4-1,3,4-噁二唑啉衍生物,其结构经~1H NMR,13C NMR,IR,MS(EI)和元素分析表征。 相似文献
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α-Bromo chalcones containing 2-thiene ring were prepared in good yields by the condensation of 1-(thien-3-yl)ethanone with aromatic aldehydes, followed by bromination with bromine and selective dehydrobromination with triethyl amine at room temperature. 相似文献
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A series of 4-aryl-6-aryloxymethylmorpholin-3-one derivatives were synthesized very efficiently from readily available starting compounds in two steps. Ring opening reactions of epoxides with aniline compounds on alumina gave corresponding β-aminoalcohols (3). The resulting β-aminoalcohols were reacted with 2-chloroacetyl chloride to yield the desired 4-aryl-6-aryloxymethylmorpholin-3-one derivatives (5). All compounds 5 were assayed for inhibitory activity against A549 lung cancer cell growth, and the inhibitory effect of the novel morpholin-3-ones on cell viability was dose-dependent. 相似文献
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A new class of pyrazolone derivatives has been isolated in good to excellent yields from the 2:1 condensation reaction between 3‐methyl‐1‐phenyl‐5‐pyrazolone and arylaldehydes in the presence of ionic liquid [HMIM]HSO4. The compounds were characterised by their IR, NMR spectra, MS and elemental analyses. The important features of the methodology are a wide application range of substrates, higher yields and shorter reaction time. 相似文献
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The synthesis, luminescence and electrochemical properties of two novel phenothiazine derivatives were presented, which exhibit good one-photon fluorescence emission. The quantum yields and solvent effects of them were studied in detail. Compound 3,7-bis(2-4'-imidazolylbenzylidenehydrazonoethyl)-(0-ethylphenothiazine) (5) was used as an effective initiator, of which two-photon fluorescence spectra were investigated under 800 nm fs laser pulse and the measured two-photon absorption cross-section was 18 × 10^-50 cm^4·s per photon. Two-photon initiated polymerization microfabrication experiments were carried out. X-ray diffraction analyses revealed that the shape of the compound 3,7-bis(2-pyrid-4'-ylmethylidenehydrazonoethyl)-(0-ethylphenothiazine) (4) looks like a butterfly with nearly planar wings. The dihedral angle of the two benzene rings is 37.6° and there is an obvious π-π stacking interaction between the molecules in the crystal. 相似文献
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聚吡咯衍生物的合成及液晶性能 总被引:1,自引:0,他引:1
系统论述了新型导电功能性液晶聚合物3-和N-液晶基元取代聚吡咯的合成和液晶行为。指出通过化学氧化聚合、电化学氧化聚合和脱卤缩合聚合可以获得液晶性聚吡咯衍生物。它们均显示热致液晶行为,且多数呈现近晶液晶相,少数呈现向列液晶相,有些具有2种近晶相,有些具有单变液晶性。N-液晶基元取代聚吡咯比3-位取代聚吡咯具有较高的液晶稳定性。较长的亚甲基间隔和极性的介晶基团能够使N-取代聚吡咯具有较大的液晶微区和稳定的液晶相。N-取代液晶聚吡咯在摩擦力的作用下还可以诱发单轴取向。这种热致液晶性聚吡咯衍生物的研究成功有希望克服聚吡咯难以成型加工的巨大障碍。 相似文献
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A convenient method to synthesize a series of monofluoro γ-lactones and pyrrolidine derivatives in moderate to good yields via the electrophilic fluorination of γ-allenoic acids and tosylamides using Selectfluor was developed. 相似文献
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棒状双酯基磁性液晶的合成及其磁性和液晶性 总被引:2,自引:0,他引:2
以端基为C3及C5取代的多环酸为原料, 合成了6个具有双酯基中介核, 末端为TEMPO (TEMPO=2,2,6,6-tetramethylpiperidine-1-oxyl)的磁性分子. 用元素分析, 红外光谱, 质谱等对其结构进行了表征; 利用超导量子干涉仪(SQUID磁学测量系统), 顺磁共振仪, 差热扫描量热仪以及热台偏光显微镜等对化合物的磁性质和液晶性质进行了测定, 提出了该类化合物同时具有磁性及液晶性所应具备的分子结构; 最后, 将磁性液晶与液晶材料进行了混配, 测试了混配液晶的光电性能. 结果表明, 6个化合物均同时具有磁性和液晶性, 其液晶相温度区间在16~24.8 ℃, 呈典型的向列相织构; 磁性液晶与液晶材料混配后可明显改善液晶材料的响应灵敏度. 相似文献
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以6-氯-3-吡啶甲醛为原料, 通过多步反应合成了一系列3-(吗啉吡啶基)-5-取代异噁唑类化合物, 并用IR, 1H NMR, 13C NMR和MS进行了结构确证. 这些化合物均以异噁唑为母核, 具有近似的平面结构, 在异噁唑环的3-位引入吗啉吡啶基, 而在5-位引入酯基、取代氨基、三唑环和噁唑烷酮环. 研究了这些化合物对金黄色葡萄球菌、耐甲氧西林金黄色葡萄球菌、表皮葡萄球菌、粪肠球菌和大肠杆菌的抑制活性, 发现与噁唑烷酮类上市药物利奈唑胺相比, 目标化合物均显示出更低的抗菌活性, 最低抑制浓度(MIC)大于32 mg/L, 这些试验结果表明异噁唑母核的5-位缺乏sp3杂化结构, 可能会导致抗菌活性的显著降低. 相似文献
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一类吡唑衍生物的3D-QSAR研究 总被引:2,自引:0,他引:2
通过比较分子力场分析方法(CoMFA)和比较分子相似性指数分析方法 (CoMSIA),系统研究了30个2-烷基(烷硫基)-5-吡唑基-1,3,4-噁二唑(噻二?
颉⑷颍├嗷衔镆种扑疚瓶莶【锘钚缘娜酆隙抗剐Ч叵怠6杂?
CoMFA,研究了不同移动步长对考虑静电场和立体场作用时构效关系的影响;对于 CoMSIA,研究了移动步长、场的组合、衰减因子α等参数变化对构效关系的影响, 发现当考虑立体场、疏水场、氢键受体场的贡献时能得到较好的结果。分别得到了 两种方法最为理想的3D-QSAR模型,所得三维等值线图为发现更高活性化合物提供 了有力的指导作用。 相似文献